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Show 1876.] MR. G. E. DOBSON ON THE MOLOSSI. 713 Fur short, and intensely black above and beneath. The muzzle in front of the ears is nearly naked, also the inferior surface of the lower jaw. The fur of the body extends upon the wing-membrane above almost as far as a line drawn from the middle of the humerus to the knee-joint; beneath, as far as a line drawn from the middle of the humerus to the middle of the femur ; a small patch of fur appears on the upper surface of the antebrachial membrane near the forearm ; and the base of the interfemoral is covered; but the remainder of the membranes are naked. Upper incisors close together, parallel; lower incisors very small, bifid, the outer incisor on each side concealed between the middle incisor and the base of the canine; inner basal cusps of the lower canines almost touching behind the incisors as in M. rufus. First upper premolar very small, scarcely raised above the gum, and scarcely visible without aid of a lens, in the small space between the canine and second premolar, but close to the outer margin of that space; in another specimen, this small premolar is larger, and outside the tooth-row, though a narrow space still intervenes between the canine and the second premolar. Length (of an adult $ ) : head and body 3"*25; tail 1"*8, tail free from membrane 0"*9 ; head 1"*15; ear 0"*8, tragus 0"*12; forearm 2"*45 ; thumb 0"*45 ; second finger-metacarp. 2"*4 ; 1st ph. 1"*1, 2nd ph. 1"*3 ; third finger-metacarp. 2"*3, 1st ph. 0"*9, 2nd ph. 0"*4 ; fourth finger-metacarp. 1"*2, 1st ph. 0"*8, 2nd ph. 0"*35 ; tibia 0"*7 ; foot and claws 0"*4. Hab. Brazil (Mato Grosso, Barra do Rio Negro); Surinam; Peru. Prof. Peters has very kindly sent m e a specimen of this species which he had determined by direct comparison with the type in the Leyden Museum. The absence of a gular sac, mentioned by Temminck, is due to the immature condition of the specimen from which the original description was taken. 7. MOLOSSUS PEROTIS. Dysopes perotis, Wied, Beitr. Naturg. Brasil. ii. (1825), p. 227 ; Wagner, Suppl. Schreb. Saugeth. i. p. 473, v. p. 708; Burmeister, Thiere Brasiliens, p. 68 (1854). Dysopes rufus, Temm. (non Geoffr.), Monogr. Mammal, i. p. 230 (1835-41). Dysopes (Molossus) gigas, Peters, Mon. Akad. Berl. 1864, p. 381. Molossus (Promops) perotis, Peters, I.e. 1865, p. 574. Ears very large, united in front; laid forwards, they extend beyond the extremity of the nose ; the outer and inner margins of the ear-conch regularly circular; antitragus much longer than high, convex, separated posteriorly by an angular notch, tragus quadrate with rounded angles, no prominent lobule at the base of the outer margin; keel of the ear-conch well developed, thickened and flattened externally. Muzzle very obliquely truncated, the extremity of the nose projecting much beyond the retracted upper lip, which is also concealed by a fringe of short hairs ; nasal apertures directed |